Professor
- Locations
- Lab 319b
Room 316
- Phone numbers
- 7786 (Office)
64 3 479 7786 (Office Direct Dial)
7786 (Lab)
- niels.kjaergaard@otago.ac.nz
- Research Group
- https://kjaergaardlab.physics.otago.ac.nz/
Download the vCard for Professor Niels Kjaergaard
Biography
Niels Kjærgaard received his PhD in 2001 from Aarhus University, Denmark.
We are presently developing a novel collider to perform high precision atomic physics measurements. This research is supported for three years by the Marsden Fund, selected in the 2011 round as one of 5 projects funded across Physics, Chemistry, and Biochemistry in New Zealand. As the high-energy colliders used in particle physics like the LHC at CERN, our apparatus will smash together bunches of atoms and analyze the spatial distribution of the scattered debris. However, our collider will operate in a regime of extreme contrast: it will use samples of atoms at nano-Kelvin temperatures accelerated to pedestrian velocities of up to a meter per second. The full execution of this collider utilizes a collaboration with theorists who have developed state-of-the-art calculations to extract key information from the experimental scattering patterns.
Publications
Deb, A. B., & Kjærgaard, N. (2021). Observation of Pauli blocking in light scattering from quantum degenerate fermions. Science, 374(6570), 972-975. doi: 10.1126/science.abh3470
Journal - Research Article
Thomas, R., Chilcott, M., Tiesinga, E., Deb, A. B., & Kjærgaard, N. (2018). Observation of bound state self-interaction in a nano-eV atom collider. Nature Communications, 9, 4895. doi: 10.1038/s41467-018-07375-8
Journal - Research Article
Horvath, M. S. J., Thomas, R., Tiesinga, E., Deb, A. B., & Kjærgaard, N. (2017). Above-threshold scattering about a Feshbach resonance for ultracold atoms in an optical collider. Nature Communications, 8, 452. doi: 10.1038/s41467-017-00458-y
Journal - Research Article
Thomas, R., Roberts, K. O., Tiesinga, E., Wade, A. C. J., Blakie, P. B., Deb, A. B., & Kjærgaard, N. (2016). Multiple scattering dynamics of fermions at an isolated p-wave resonance. Nature Communications, 7, 12069. doi: 10.1038/ncomms12069
Journal - Research Article
Appel, J., Windpassinger, P. J., Oblak, D., Hoff, U. B., Kjærgaard, N., & Polzik, E. S. (2009). Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit. PNAS, 106(27), 10960-10965. doi: 10.1073/pnas.0901550106
Journal - Research Article
Chilcott, M., Thomas, R., & Kjærgaard, N. (2021). Experimental observation of the avoided crossing of two S-matrix resonance poles in an ultracold atom collider. Physical Review Research, 3(3), 033209. doi: 10.1103/PhysRevResearch.3.033209
Journal - Research Article
Deb, A. B., & Kjærgaard, N. (2021). Observation of Pauli blocking in light scattering from quantum degenerate fermions. Science, 374(6570), 972-975. doi: 10.1126/science.abh3470
Journal - Research Article
Otto, J. S., Hunter, M. K., Kjærgaard, N., & Deb, A. B. (2021). Data capacity scaling of a distributed Rydberg atomic receiver array. Journal of Applied Physics, 129(15), 154503. doi: 10.1063/5.0048415
Journal - Research Article
Thomas, R., Otto, J. S., Chilcott, M., Deb, A. B., & Kjærgaard, N. (2021). Reducing number fluctuations in an ultracold atomic sample using Faraday rotation and iterative feedback. Physical Review A, 16, 064033. doi: 10.1103/PhysRevApplied.16.064033
Journal - Research Article
Deb, A. B., Chung, J., & Kjærgaard, N. (2020). Dispersive detection of atomic ensembles in the presence of strong lensing. New Journal of Physics, 22, 073017. doi: 10.1088/1367-2630/ab9553
Journal - Research Article
Otto, J. S., Kjærgaard, N., & Deb, A. B. (2020). Strong zero-field Förster resonances in K-Rb Rydberg systems. Physical Review Research, 2(3), 033474. doi: 10.1103/PhysRevResearch.2.033474
Journal - Research Article
Thomas, R., & Kjærgaard, N. (2020). A digital feedback controller for stabilizing large electric currents to the ppm level for Feshbach resonance studies. Review of Scientific Instruments, 91(3), 034705. doi: 10.1063/1.5128935
Journal - Research Article
Sawyer, B. J., Chilcott, M., Thomas, R., Deb, A. B., & Kjærgaard, N. (2019). Deterministic quantum state transfer of atoms in a random magnetic field. European Physical Journal D, 73(8), 160. doi: 10.1140/epjd/e2019-90541-2
Journal - Research Article
Chisholm, C. S., Thomas, R., Deb, A. B., & Kjærgaard, N. (2018). A three-dimensional steerable optical tweezer system for ultracold atoms. Review of Scientific Instruments, 89, 103105. doi: 10.1063/1.5041481
Journal - Research Article
Deb, A. B., & Kjærgaard, N. (2018). Radio-over-fiber using an optical antenna based on Rydberg states of atoms. Applied Physics Letters, 112(21), 211106. doi: 10.1063/1.5031033
Journal - Research Article
Thomas, R., Chilcott, M., Tiesinga, E., Deb, A. B., & Kjærgaard, N. (2018). Observation of bound state self-interaction in a nano-eV atom collider. Nature Communications, 9, 4895. doi: 10.1038/s41467-018-07375-8
Journal - Research Article
Horvath, M. S. J., Thomas, R., Tiesinga, E., Deb, A. B., & Kjærgaard, N. (2017). Above-threshold scattering about a Feshbach resonance for ultracold atoms in an optical collider. Nature Communications, 8, 452. doi: 10.1038/s41467-017-00458-y
Journal - Research Article
Langbecker, M., Noaman, M., Kjærgaard, N., Benabid, F., & Windpassinger, P. (2017). Rydberg excitation of cold atoms inside a hollow-core fiber. Physical Review A, 96(4), 041402(R). doi: 10.1103/PhysRevA.96.041402
Journal - Research Article
Sawyer, B. J., Horvath, M. S. J., Tiesinga, E., Deb, A. B., & Kjærgaard, N. (2017). Dispersive optical detection of magnetic Feshbach resonances in ultracold gases. Physical Review A, 96(2), 022705. doi: 10.1103/PhysRevA.96.022705
Journal - Research Article
Thomas, R., Roberts, K. O., Tiesinga, E., Wade, A. C. J., Blakie, P. B., Deb, A. B., & Kjærgaard, N. (2016). Multiple scattering dynamics of fermions at an isolated p-wave resonance. Nature Communications, 7, 12069. doi: 10.1038/ncomms12069
Journal - Research Article
Deb, A. B., McKellar, T., & Kjærgaard, N. (2014). Optical runaway evaporation for the parallel production of multiple Bose-Einstein condensates. Physical Review A, 90(5), 051401(R). doi: 10.1103/PhysRevA.90.051401
Journal - Research Article
Roberts, K. O., McKellar, T., Fekete, J., Rakonjac, A., Deb, A. B., & Kjærgaard, N. (2014). Steerable optical tweezers for ultracold atom studies. Optics Letters, 39(7), 2012-2015. doi: 10.1364/OL.39.002012
Journal - Research Article
Deb, A. B., Sawyer, B. J., & Kjærgaard, N. (2013). Dispersive probing of driven pseudospin dynamics in a gradient field. Physical Review A, 88(6), 063607.
Journal - Research Article
Rakonjac, A., Roberts, K. O., Deb, A. B., & Kjærgaard, N. (2013). Note: Computer controlled rotation mount for large diameter optics. Review of Scientific Instruments, 84, 026107. doi: 10.1063/1.4791796
Journal - Research Article
Deb, A. B., Rakonjac, A., & Kjærgaard, N. (2012). Versatile laser system for experiments with cold atomic gases. Journal of the Optical Society of America B, 29(11), 3109-3113. doi: 10.1364/josab.29.003109
Journal - Research Article
Rakonjac, A., Deb, A. B., Hoinka, S., Hudson, D., Sawyer, B. J., & Kjærgaard, N. (2012). Laser based accelerator for ultracold atoms. Optics Letters, 37(6), 1085-1087. doi: 10.1364/OL.37.001085
Journal - Research Article
Sawyer, B. J., Deb, A. B., McKellar, T., & Kjærgaard, N. (2012). Reducing number fluctuations of ultracold atomic gases via dispersive interrogation. Physical Review A, 86(6), 065401. doi: 10.1103/PhysRevA.86.065401
Journal - Research Article
Louchet-Chauvet, A., Appel, J., Renema, J. J., Oblak, D., Kjaergaard, N., & Polzik, E. S. (2010). Entanglement-assisted atomic clock beyond the projection noise limit. New Journal of Physics, 12. doi: 10.1088/1367-2630/12/6/065032
Journal - Research Article
Appel, J., Windpassinger, P. J., Oblak, D., Hoff, U. B., Kjærgaard, N., & Polzik, E. S. (2009). Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit. PNAS, 106(27), 10960-10965. doi: 10.1073/pnas.0901550106
Journal - Research Article
Windpassinger, P. J., Kubasik, M., Koschorreck, M., Boisen, A., Kjærgaard, N., Polzik, E. S., & Müller, J. H. (2009). Ultra low-noise differential ac-coupled photodetector for sensitive pulse detection applications. Measurement Science & Technology, 20(5). doi: 10.1088/0957-0233/20/5/055301
Journal - Research Article